This is it, thanks !
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[sudo apt-get update]
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Fetched 20.2 MB in 60s (333 kB/s)
Reading package lists... Done
==================================================================================================== =========
[sudo apt-get dist-upgrade]
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
libreoffice-help-en-gb
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/9,060 kB of archives.
After this operation, 18.4 kB of additional disk space will be used.
Do you want to continue [Y/n]? y
(Reading database ... 307717 files and directories currently installed.)
Preparing to replace libreoffice-help-en-gb 1:3.5.3-0ubuntu1 (using .../libreoffice-help-en-gb_1%3a3.5.4-0ubuntu1_all.deb) ...
Unpacking replacement libreoffice-help-en-gb ...
dpkg-deb (subprocess): data: internal bzip2 read error: 'DATA_ERROR'
dpkg-deb: error: subprocess <decompress> returned error exit status 2
dpkg: error processing /var/cache/apt/archives/libreoffice-help-en-gb_1%3a3.5.4-0ubuntu1_all.deb (--unpack):
short read on buffer copy for backend dpkg-deb during `./usr/share/libreoffice/help/en-GB/swriter.jar'
Errors were encountered while processing:
/var/cache/apt/archives/libreoffice-help-en-gb_1%3a3.5.4-0ubuntu1_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)